"This booklet, prepared by the Vehicle Maintenance Section, Division of Motor Transport, Office of Defense Transportation, should serve as a guide to every truck owner, operator, and mechanic in the proper maintenance of America's trucks. Every American should realize that serious failures in our transportation system may not cost the lives ordinarily lost in highway accidents, but may cost the lives of whole companies of men at the front because they were not supplied with the implements of war necessary to protect themselves. A breakdown of the transportation system of any country at war may easily cost that country the war. Ours must not break down. Do your part to keep America's trucks rolling!"